There are dozens of free media players and then there’s GOM Player. Apart from the obvious video and audio playback capabilities...

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— How come I use GOM Audio and SI detects it as another GOM product and tells me I use an old version?

You should simply ignore this error. Try downloading the installation package for your product and update it to the latest version and SI will ignore it. This is just a simple error for apps... that might share a registry or two and since they both have GOM in the description it's probably a detection error.
If you want, create an account on the SI website and visit the page of GOM Audio and GOM Player and submit the correct updates. Read more